Gas. For hydrogen to become a liquid, you need to cool it down to 20.28 K, which is -252.87 degrees Celcius, or -434.45 degrees Fahrenheit if that is more your style. 6 people found this useful.
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  voice, sound, vocalize, vocalise(verb) utter with vibrating vocal chords. 2  vocalize, vocalise(verb) sing (each note a scale or in a melody) with the same vowel. 3  vocalize, vocalise, vowelize, vowelise(verb) pronounce as a vowel.
Definition of voice for Students. 1  1 : sound that passes out of the mouth and throat of vertebrates and especially human beings and is produced mainly by the vibration of the vocal cords within the larynx (as in speaking or shouting) 2  2 : musical sounds produced by singing We love listening to her beautiful voice.